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# Any suggestions on this one?

Author Message
Senior Manager
Joined: 25 Sep 2018
Posts: 426
Location: United States (CA)
Concentration: Finance, Strategy
GMAT 1: 640 Q47 V30
GPA: 3.97
WE: Investment Banking (Investment Banking)
Re: Any suggestions on this one?  [#permalink]

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02 Feb 2019, 21:53
P of raining atleast 3 days out of 5. R is probability it will rain and N is it won't rain
RRRNN or RRRRN or RRRRR
So you just have to add these probablities.
Probability that it will rain is 1/2. No rain is 1/2
(1/2)^5 + (1/2)^5 +(1/2)^5 =3/32

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GMAT 1: 680 Q49 V34
Re: Any suggestions on this one?  [#permalink]

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02 Feb 2019, 22:09
bellabrown wrote:
If the probability of rain on any given day is 50%, what is the probability that it will rain on at least three days in a row during a five-day period?

A. 3/32
B. 1/4
C. 9/32
D. 5/16
E. 1/2

This question has been already dicussed here https://gmatclub.com/forum/if-the-proba ... l#p2116736

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Re: Any suggestions on this one?   [#permalink] 02 Feb 2019, 22:09
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# Any suggestions on this one?

Moderator: DisciplinedPrep